3876309

Information

• Patent Grant
• 3876309

• References
• Source

• Patent Number

  3,876,309

• Date Filed

  Not available

• Date Issued

  Tuesday, April 8, 1975
  49 years ago

• CPC

  • G01C15/002 - Active optical surveying means
  • G05D3/1409 - with dc amplifier chain

• US Classifications

  • 356 - Optics: measuring and testing
  • 033 - Geometrical instruments